#region Copyright Notices
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Library General Public License for more details.
// 
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free
// Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#endregion

using System;

namespace Yarr
{
	/// <summary>
	/// The DefaultProfiler does nothing except provide
	/// a placeholder implementation of IProfiler
	/// </summary>
	internal class DefaultProfiler : IProfiler
	{
        /// <summary>
        /// Default implementation -- does nothing
        /// </summary>
        public void Open()
        {
        }

        /// <summary>
        /// Defualt implementation -- does nothing
        /// </summary>
        /// <param name="form"></param>
        /// <param name="env"></param>
        public object TraceCall (object form, Environment env) 
		{
            return form;
		}

        /// <summary>
        /// Defualt implementation -- does nothing
        /// </summary>
        /// <param name="comment"></param>
        /// <param name="env"></param>
        public void Comment (string comment, Environment env) 
		{
            System.Diagnostics.Debug.Write(comment);
            System.Diagnostics.Debug.Flush();
		}

        /// <summary>
        /// Defualt implementation -- does nothing
        /// </summary>
        /// <param name="form"></param>
        /// <param name="env"></param>
        /// <returns></returns>
		public object TraceReturn (object form, Environment env) 
		{
			return form;
		}

        /// <summary>
        /// Defualt implementation -- does nothing
        /// </summary>
        public void Close() 
		{
		}
	}
}
